Did the customer follow EBS development guidelines when creating this limitation customization? It appears that section of code from FND_WEBFILEPUB is selecting from FND_LOOKUP_VALUES where lookup_type = 'FND_ISO_CHARACTER_SET_MAP'. Make sure the custom process has access to perform that operation. What version of EBS is this?
Thank you for your update.
Customer can reproduce this issue using browse to open the concurrent output/log file (not call the customization package)
When customer try to open concurrent output/log 100 times,this issue will occur 1~2 times.
the error line is variables,such as line 136 or line 222 or line 203,but the package is same (FND_WEBFILEPUB).
The EBS version is R12.1.3 with DB 184.108.40.206.(it strange that EBS DB 220.127.116.11 works well,not meet this issue. customer met this issue after DB upgrade from 18.104.22.168 to 22.214.171.124 )